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    1980 Kz250 won't rev over 4000 rpm

    1980 KZ 250 with a Keihin CV32 carb. Bike won´t rev past 4000 rpm. It gets there and just dies. I have cleaned the carb, adjusted the timing and valves. Everything is clean. The bike idles great but when I throttle it up to 4000 rpm it just dies. The main jet is clean and the bike used to run...
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